<template>
  <div id="tags-view-container" class="tags-view-container">
    <scroll-pane ref="scrollPane" class="tags-view-wrapper">
      <router-link
        v-for="tag in visitedViews"
        ref="tag"
        :key="tag.path"
        :class="isActive(tag)?'active':''"
        :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
        class="tags-view-item"
        @click.middle.native="closeSelectedTag(tag)"
        @contextmenu.prevent.native="openMenu(tag,$event)"
      >
        <span>{{ tag.title }}</span>
        <span v-if="!tag.meta.affix" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
      </router-link>
    </scroll-pane>
    <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
      <li @click="refreshSelectedTag(selectedTag)">刷新页面</li>
      <li v-if="!(selectedTag.meta&&selectedTag.meta.affix)" @click="closeSelectedTag(selectedTag)">关闭当前</li>
      <li @click="closeOthersTags">关闭其他</li>
      <li @click="closeAllTags(selectedTag)">关闭所有</li>
    </ul>
  </div>
</template>
<script lang="ts">
import ScrollPane from './ScrollPane.vue';
import {Component, Ref, Vue, Watch} from 'vue-property-decorator';
import path from 'path';
import {Getter} from 'vuex-class';

@Component({components: {ScrollPane}})
export default class TagsView extends Vue {
  private visible = false;
  private top = 0;
  private left = 0;
  private selectedTag: any = {};
  private affixTags: Array<any> = [];
  @Getter('visitedViews') private visitedViews!: any;
  @Getter('routers') private routers!: any;
  @Ref("scrollPane") private scrollPane: any;
  @Ref("tag") private tags: any;

  @Watch('$route')
  onRouteChanged() {
    this.addTags();
    this.moveToCurrentTag();
  }

  @Watch('visible')
  onVisibleChanged(value: any) {
    if (value) {
      document.body.addEventListener('click', this.closeMenu, {passive: false});
    } else {
      document.body.removeEventListener('click', this.closeMenu);
    }
  }

  mounted() {
    this.initTags();
    this.addTags();
  }


  isActive(route: any) {
    return route.path === (this as any).$route.path;
  }

  filterAffixTags(routes: any, basePath = '/') {
    let tags: any = [];
    routes.forEach((route: any) => {
      if (route.meta && route.meta.affix) {
        const tagPath = path.resolve(basePath, route.path);
        tags.push({
          fullPath: tagPath,
          path: tagPath,
          name: route.name,
          meta: {...route.meta}
        });
      }
      if (route.children) {
        const tempTags = this.filterAffixTags(route.children, route.path);
        if (tempTags.length >= 1) {
          tags = [...tags, ...tempTags];
        }
      }
    });
    return tags;
  }

  initTags() {
    const affixTags = this.affixTags = this.filterAffixTags(this.routers);
    for (const tag of affixTags) {
      // Must have tag name
      if (tag.name) {
        (this as any).$store.dispatch('addVisitedView', tag).catch(reason => console.log(reason));
      }
    }
  }

  addTags() {
    const {name} = (this as any).$route;
    if (name) {
      (this as any).$store.dispatch('addView', (this as any).$route).catch(reason => console.log(reason));
    }
  }


  moveToCurrentTag() {
    this.$nextTick(() => {
      for (const tag of this.tags) {
        if (tag.to.path === (this as any).$route.path) {
          this.scrollPane.moveToTarget(tag);
          // when query is different then update
          if (tag.to.fullPath !== (this as any).$route.fullPath) {
            (this as any).$store.dispatch('updateVisitedView', (this as any).$route).catch(reason => console.log(reason));
          }
          break;
        }
      }
    });
  }


  refreshSelectedTag(view: any) {
    (this as any).$store.dispatch('delCachedView', view).then(() => {
      const {fullPath} = view;
      this.$nextTick(() => {
        (this as any).$router.replace({
          path: '/redirect' + fullPath
        }).catch(reason => console.log(reason));
      });
    });
  }


  closeSelectedTag(view: any) {
    (this as any).$store.dispatch('delView', view).then(({visitedViews}) => {
      if (this.isActive(view)) {
        this.toLastView(visitedViews, view);
      }
    }).catch((e) => {
      console.log(e);
    });
  }


  closeOthersTags() {
    (this as any).$router.push(this.selectedTag).catch(reason => console.log(reason));
    (this as any).$store.dispatch('delOthersViews', this.selectedTag).then(() => {
      this.moveToCurrentTag();
    }).catch((e) => {
      console.log(e);
    });
  }


  closeAllTags(view: any) {
    (this as any).$store.dispatch('delAllViews').then(({visitedViews}) => {
      // if (this.affixTags.some(tag => tag.path === view.path)) {
      //     return;
      // }
      this.toLastView(visitedViews, view);
    }).catch((e) => {
      console.log(e);
    });
  }


  toLastView(visitedViews: any, view: any) {
    const latestView = visitedViews.slice(-1)[0];
    if (latestView) {
      (this as any).$router.push(latestView).catch((e) => {
        console.log(e);
      });
    } else {
      if (view.name === 'Dashboard') {
        (this as any).$router.replace({path: '/redirect' + view.fullPath}).catch(reason => console.log(reason));
      } else {
        (this as any).$router.push('/').catch(reason => console.log(reason));
      }
    }
  }


  openMenu(tag: any, e: any) {
    const menuMinWidth = 105;
    const offsetLeft = this.$el.getBoundingClientRect().left;// container margin left
    const offsetWidth = (this as any).$el.offsetWidth; // container width
    const maxLeft = offsetWidth - menuMinWidth + offsetLeft; // left boundary
    const left = e.clientX + 15; // 15: margin right

    if (left > maxLeft) {
      this.left = maxLeft;
    } else {
      this.left = left;
    }

    this.top = e.clientY + 10;
    this.visible = true;
    this.selectedTag = tag;
  }

  closeMenu() {
    this.visible = false;
  }
}
</script>

<style scoped lang="scss">
.tags-view-container {
  height: 35px;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #d8dce5;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);

  .tags-view-wrapper {
    .tags-view-item {
      display: inline-block;
      position: relative;
      cursor: pointer;
      height: 26px;
      line-height: 26px;
      border: 1px solid #d8dce5;
      color: #495060;
      background: #fff;
      padding: 0 8px;
      font-size: 12px;
      margin-left: 5px;
      margin-top: 4px;
      user-select: none;

      &:first-of-type {
        margin-left: 15px;
      }

      &:last-of-type {
        margin-right: 15px;
      }

      &.active {
        background-color: #42b983;
        color: #fff;
        border-color: #42b983;

        &::before {
          content: '';
          background: #51f30f;
          display: inline-block;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          position: relative;
          margin-right: 2px;
        }
      }

      ::v-deep(.el-icon-close) {
        margin-left: 5px;

        &:hover {
          background-color: #E65D6E;
        }
      }
    }
  }

  .contextmenu {
    margin: 0;
    background: #fff;
    z-index: 3000;
    position: absolute;
    list-style-type: none;
    padding: 5px 0;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 400;
    color: #333;
    box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

    li {
      margin: 0;
      padding: 7px 16px;
      cursor: pointer;

      &:hover {
        background: #eee;
      }
    }
  }
}
</style>

